/Engine/Plugins/Runtime/XRBase/Source/XRBase/Public/DefaultSpectatorScreenController.h
virtual void RenderSpectatorModeMirrorAndTexture ( [FRHICommandListImmediate](API\Runtime\RHI\FRHICommandListImmediate) & RHICmdList, FTexture2DRHIRef TargetTexture, FTexture2DRHIRef EyeTexture, FTexture2DRHIRef OtherTexture, FVector2D WindowSize )